CHEMICAL NATURE OF ORGANIC PHOSPHORUS IN CULTIVATED AND UNCULTIVATED SOILS UNDER DIFFERENT ENVIRONMENTAL-CONDITIONS

被引:161
作者
CONDRON, LM [1 ]
FROSSARD, E [1 ]
TIESSEN, H [1 ]
NEWMAN, RH [1 ]
STEWART, JWB [1 ]
机构
[1] UNIV SASKATCHEWAN, SASKATCHEWAN INST PEDOL, SASKATOON S7N 0W0, SASKATCHEWAN, CANADA
来源
JOURNAL OF SOIL SCIENCE | 1990年 / 41卷 / 01期
关键词
D O I
10.1111/j.1365-2389.1990.tb00043.x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
A sequential alkali extraction procedure followed by ultrafiltration and quantitative 31P nuclear magnetic resonance (NMR) spectroscopy was used to examine organic phosphorus in a Brown Chernozem, and an adjacent Gleysol developed under native prairie vegetation, and a Grey Luvisol formed under aspen forest in Saskatchewan, Canada. Differences in the nature of organic P in the native soils were related to moisture status and vegetation. In the grassland soils, a greater proportion of orthophosphate diester P was found in the bottom‐slope Gleysol. This difference was partly attributed to less favourable conditions for mineralization in the bottom slope soil compared with the mid‐slope Brown Chernozem. Teichoic acid P occurred only in the native Grey Luvisol (NMR δ p.p.m. 0.36‐0.95) under boreal forest and not under native grassland. At all three sites, soils under long‐term cultivation were also examined and while orthophosphate monoester P (83.4‐94.6% total Po), orthophosphate diester P (3.9–8.7% total Po) and teichoic acid P (12.7% total Po in forested Grey Luvisol) were detected in native soils, only orthophosphate monoester P was found in the corresponding soils that had been cultivated for 70–80 years. These findings suggest that orthophosphate diester P and teichoic acid P are more readily mineralized in the soil environment than orthophosphate monoester P forms. Copyright © 1990, Wiley Blackwell. All rights reserved
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页码:41 / 50
页数:10
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